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Physics-(general)

NEET Physics (general) MCQ Question

Type: MCQ-numerical-Medium-Class 12

What is the wavelength of light needed to eject electrons from a metal with a work function of 2.14 eV, if the stopping potential is 0.60 V?

A

454 nm

B

412 nm

C

523 nm

D

389 nm

Correct Answer

Option A

Detailed Explanation

Using the equation λ=hceV0+ϕ\lambda = \frac{hc}{eV_0 + \phi} with eV0=0.60 eV,ϕ=2.14 eVeV_0 = 0.60 \text{ eV}, \phi = 2.14 \text{ eV}, and hc=1240 eV nmhc = 1240 \text{ eV nm}, we get λ=454 nm\lambda = 454 \text{ nm}.

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